/Engine/Source/Runtime/Engine/Classes/Engine/EngineCustomTimeStep.h
A CustomTimeStep control the Engine Framerate/Timestep. This will update the FApp::CurrentTime/FApp::DeltaTime. This is useful when you want the engine to be synchronized with an external clock (genlock).
class UEngineCustomTimeStep : public [UObject](API\Runtime\CoreUObject\UObject\UObject)